This is slightly confusing:

Luke senses Vader on Endor and goes to him.
But we only see Vader landing after that!

It’s obvious the scenes where intended on a different sequence. Something like:

After 3CPO’s God scene, we cut to Vader landing (at dusk).
Normal Ewok village scenes. Luke notices Vader’s presence. If you look at Luke’s expressions during 3CPO’s story, it’s clear he is distracted. (night).
Luke talks with Leia and goes to Vader (early dawn).
Imperial walker closeup, then platform scenes with Luke and Vader as normal (light here also implies dawn).

I’ve edited it like this and it works. You need to show time passing, otherwise Luke leaves in a rush.
Here’s what I have (along with many many edits, like no Han when Luke leaves Leia and WIP color correction 😉 )
https://streamable.com/sf27l